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-rw-r--r--virt/kvm/kvm_main.c10
1 files changed, 9 insertions, 1 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 5fed9bfc3cf..5f865ed4c43 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1086,7 +1086,7 @@ int __kvm_set_memory_region(struct kvm *kvm,
{
int r;
gfn_t base_gfn;
- unsigned long npages;
+ unsigned long npages, ugfn;
int largepages;
unsigned long i;
struct kvm_memory_slot *memslot;
@@ -1177,6 +1177,14 @@ int __kvm_set_memory_region(struct kvm *kvm,
new.lpage_info[0].write_count = 1;
if ((base_gfn+npages) % KVM_PAGES_PER_HPAGE)
new.lpage_info[largepages-1].write_count = 1;
+ ugfn = new.userspace_addr >> PAGE_SHIFT;
+ /*
+ * If the gfn and userspace address are not aligned wrt each
+ * other, disable large page support for this slot
+ */
+ if ((base_gfn ^ ugfn) & (KVM_PAGES_PER_HPAGE - 1))
+ for (i = 0; i < largepages; ++i)
+ new.lpage_info[i].write_count = 1;
}
/* Allocate page dirty bitmap if needed */